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-rw-r--r--runtime/indent/context.vim65
1 files changed, 65 insertions, 0 deletions
diff --git a/runtime/indent/context.vim b/runtime/indent/context.vim
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+++ b/runtime/indent/context.vim
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+vim9script
+
+# Language: ConTeXt typesetting engine
+# Maintainer: Nicola Vitacolonna <nvitacolonna@gmail.com>
+# Former Maintainers: Nikolai Weibull <now@bitwi.se>
+# Latest Revision: 2022 Aug 12
+
+if exists("b:did_indent")
+ finish
+endif
+
+# Load MetaPost indentation script (this will also set b:did_indent)
+runtime! indent/mp.vim
+
+setlocal indentexpr=ConTeXtIndent()
+
+b:undo_indent = "setl indentexpr<"
+
+def PrevNotComment(l: number): number
+ var prevlnum = prevnonblank(l)
+
+ while prevlnum > 0 && getline(prevlnum) =~# '^\s*%'
+ prevlnum = prevnonblank(prevlnum - 1)
+ endwhile
+
+ return prevlnum
+enddef
+
+def FindPair(pstart: string, pmid: string, pend: string): number
+ cursor(v:lnum, 1)
+ return indent(searchpair(pstart, pmid, pend, 'bWn',
+ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
+enddef
+
+def ConTeXtIndent(): number
+ # Use MetaPost rules inside MetaPost graphic environments
+ if len(synstack(v:lnum, 1)) > 0 &&
+ synIDattr(synstack(v:lnum, 1)[0], "name") ==# 'contextMPGraphic'
+ return g:MetaPostIndent()
+ endif
+
+ const prevlnum = PrevNotComment(v:lnum - 1)
+ const prevind = indent(prevlnum)
+ const prevline = getline(prevlnum)
+ const currline = getline(v:lnum)
+
+ # If the current line starts with ], match indentation.
+ if currline =~# '^\s*\]'
+ return FindPair('\[', '', '\]')
+ endif
+
+ # If the current line starts with }, match indentation.
+ if currline =~# '^\s*}'
+ return FindPair('{', '', '}')
+ endif
+
+ # If the previous line ends with [ or { (possibly followed by a comment) then indent.
+ if prevline =~# '[{[]\s*\%(%.*\)\=$'
+ return prevind + shiftwidth()
+ endif
+
+ return -1
+enddef
+
+# vim: sw=2 fdm=marker